Electro Magnetic Induction And Alternating Currents Question 402

Question: In a magnetic field of 0.05T, area of a coil changes from 101,cm2 to 100,cm2 without changing the resistance which is 2W. The amount of charge that flow during this period is [Orissa PMT 2005]

Options:

A) 2.5×10−6 coulomb

B) 2×10−6 coulomb

C) 10−6 coulomb

D) 8×10−6 coulomb

Show Answer

Answer:

Correct Answer: A

Solution:

φ=BA

Þ change in flux dφ=B.dA = 0.05 (101−100) 10−4 =5.10−6 Wb.

Now, charge dQ=dφR=5×10−62=2.5×10−6 C.

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